@Soteris Welcome to the forum. Note that if you have moved from Sky Q to Stream all your Marketplace subscriptions are cancelled so you have to re-register (see the following link)
https://www.sky.com/help/articles/sky-marketplace-upgrade
You should be able to register or re-register (if applicable) as follows:
Go to the bottom of the home page and select the following in this order: MySky / your products / (enter your PIN) / App Subscriptions
Select App subscriptions / Current / and then Paramount + Monthly. Hopefully it will say £0 per month as you have Sky Cinema. If so select Activate subscription.
Also, see the following link:
https://www.sky.com/help/articles/sky-marketplace-subscribe-to-paramount-plus
Good luck 🤞
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